And nature has made the woman's face so attractive, beautiful, their breast, their hips, attractive, their sound, talking, singing, all very attractive, walking, and now they are dressing naked. They are showing simply the vagina, all other parts of the body clothed. This is going on. Whole thing is based on sex life, and that is tuccham, most abominable. Prakṛtiṁ mohinīṁ śritāḥ. It will take three hundred times births to understand that this sex life is abominable. Therefore it is bahūnāṁ janmanām ante [Bg. 7.19]. Not that immediately, simply by hearing our Bhagavad-gita lecture, they will give it up. It will take many, many births to understand.Bahūnāṁ janmanām ante. In the Vedic system, sex life is allowed only for begetting children. Therefore they are... Restriction. Allowed, but with great restriction under religious rules and regulation and so many things, garbhādāna. Then the first principle is, even it is taken for begetting child, it is not secret.

...Garbhādāna-saṁskāra. There should be a function, all the brāhmaṇas and relatives should come, and there will be ceremony, and everyone will know that "This man is going to now sex, have sex for begetting children." This is ceremony, not secretly like cats and dogs. Cats and dogs also, they do not do secretly. A human being do it secretly and do not want the botheration. Therefore their scientific advancement means how to kill the child, how to make abortion, how to take contraceptive pills, how to distribute them, how allow the children, "Yes, you go on, but take these pills so that you may not be bothered." Yes. Why not stop it, botheration? That you cannot, because animals. Because animal civilization, they cannot do it. Kaṇḍutive manivasi viṣaheta dhīraḥ.Why don't you teach them to become dhīraḥ, sober—"Let me tolerate this itching sensation"—brahmacārī? That teaching is not good. You do it repeatedly, suffer, and suffer consequences. And to stop it they suffer in so many ways, suffering, suffering. Bahu-duḥkha bhajaḥ [SB 7.9.45]. Sex life, illicit or legal, the after-effect is suffering. Even it is not illicit—it is legal—then to take care of the wife or the children, for their education, for their upliftment and so on, so on, so on—suffering. And if it is illicit, then these sufferings: you commit sinful activities, kill the child, contraceptive, with the abortion, go to the doctor, pay, and so on, so on. So where is no suffering? Either legal or illicit, you have to suffer. Bahu-duḥkha bhajaḥ. Tṛpyanti neha kṛpana bahu-duḥkha bhajaḥ.

It is not possible to stop sex life unless you are fully Krsna Conscious

2.) Sept 29 1975 class

Prabhupāda: Yes. It cannot be. You cannot stop the sex unless you are fully in Kṛṣṇa consciousness. It is not possible. And that is the material bondage. In the material prisonhouse they have got so many means-big, big walls, handcuff, chain—but nature is so perfect that simply give you a beautiful woman, and you are all prisoner. Big wall, handcuff and chain—everything is complete. I think I have discussed in my recent purports.

Give up all sinful life and you become 50% purified to approach God

3.) Feb 22 1975 class for initiation

So our material life is now saturated with all kinds of sins. The four pillars of sinful life are these: illicit sex, meat-eating and intoxication and gambling. So if we stop these voluntarily, this is called austerity, austerity, tapasya. Austerity means voluntarily accept some painful condition. So those who are habituated to all these things, namely illicit sex, meat-eating, intoxication and gambling, to give up these habits, it may become little painful in the beginning. But if you practice and pray to Kṛṣṇa that He will help, it is not difficult to give up these habits. And as soon as you give up this wetting process, the sinful life, then immediately you become fifty percent purified to approach God. Then, by chanting Hare Kṛṣṇa mantra, you make further, further, more and more progress. And when you are completely free of all sinful reaction, then you understand God and you love him. In the contaminated stage, you are trying to love so many things, but you are frustrated. So if you can love God, then you will never be frustrated and your loving desires will be fulfilled. That is Kṛṣṇa consciousness movement. We are teaching all our students how to love God. That's all right.

Some Conclusions- In these three quotes we learn that sex life is not good-even if it is legal sex life, because there is so much botheration. If we can produce actual Krsna Conscious children, then we can produce a hundred such children for the benefit of the world. Just because somebody can follow the 4 regulative principles does not mean he is a pure devotee. It means he or she is now a real human being, distinct from all other animals. And the last one Srila Prabhupada tells us that if one can follow all 4 regulative principles that makes him or her 50% pure and is now on the way back to Godhead if he develops his love for God.